Download CBSE Class Physics 12 Pre-Board Sample Papers 2025–26 with solutions for all subjects in free PDF format. These papers are curated by experts as per the latest CBSE syllabus and exam pattern.
Five years after the collapse of the Arecibo Observatory telescope — the world’s largest single-dish radio telescope until 2016, when China completed a larger one — space physicist Qihou Zhou is ...
Last year’s reports that the BICEP2 telescope had uncovered evidence for cosmic inflation turned out to be a false alarm, but researchers in the field haven’t given up. Matthew R Francis describes how ...
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